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Ω0 from Clusters of Galaxies

Published online by Cambridge University Press:  26 May 2016

Alain. Blanchard ,
Rachida. Sadat  and
Jim. Bartlett
Alain. Blanchard
Affiliation:
LAOMP, UPS, 14, Av. Ed. Belin, 31 400 Toulouse & ULP, Strasbourg, France
Rachida. Sadat
Affiliation:
LAOMP, UPS, 14, Av. Ed. Belin, 31 400 Toulouse, France
Jim. Bartlett
Affiliation:
LAOMP, UPS, 14, Av. Ed. Belin, 31 400 Toulouse, France

Abstract

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Clusters constitute a very rich source of information for cosmology. Their present day abundance can be used to found the normalization and the shape of the power spectrum. Clusters can also be used to determine the parameter density of the universe Ω − 0. The evolution of their number density is a powerful cosmological global test of the mean density of the Universe. It is fashionable to claim that the abundance of clusters does not change very much with clusters redshift and therefore favor a low density universe. This is an overstatement and analyses based on the most recent data rather favor a high density universe. The baryon fraction in clusters is an alternative method to derive the mean density of the Universe. Here again, taking into account several biases in the baryon fraction is derived from data, the actual baryon fraction seen in clusters can be reconcilied with a high density universe.

Type
Part VIII: Dark Matter and Ω0
Information
Symposium - International Astronomical Union , Volume 201: New Cosmological Data and the Values of the Fundamental Parameters , 2005 , pp. 330 - 339
Copyright
Copyright © Astronomical Society of the Pacific 2005 

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